Total anomalous pulmonary venous connection is occasionally associated with a functional single ventricle and is thought to be a risk for the staged Fontan approach. We report a patient with a very rare presentation of mitral atresia and intact atrial septum with physiologically total anomalous pulmonary venous drainage by a connecting vein between the left atrium and the superior vena cava. A surgical atrioseptectomy as a functional repair of total anomalous pulmonary venous connection and pulmonary artery banding was successfully performed as the first palliation for Fontan completion.
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